package com.xiaoq.tool.util;

import java.text.DecimalFormat;
import java.text.FieldPosition;
import java.text.Format;
import java.text.NumberFormat;
import java.text.SimpleDateFormat;
import java.util.Calendar;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.stereotype.Component;

@Component
public class GenerateSequenceUtil {
	
	private static final Logger logger = LoggerFactory.getLogger(GenerateSequenceUtil.class);
	
	/** The FieldPosition. */  
	private static final FieldPosition HELPER_POSITION = new FieldPosition(0);  
	
	/**This Format for format the data to special format. */  
	private final static Format dateFormat = new SimpleDateFormat("YYYYMMddHHmmssS");  
	
	/** This Format for format the number tospecial format. */  
	private final static NumberFormat numberFormat = new DecimalFormat("0000");  
	
	/**This int is the sequence number ,the default value is 0. */  
	private static int seq = 0;  
	
	private static final int MAX = 9999;  
	/** 
	 * 时间格式生成序列 
	 * @return String 
	 */  
	public static synchronized String generateSequenceNo() {  
		Calendar rightNow = Calendar.getInstance();  
		StringBuffer sb = new StringBuffer();  
		dateFormat.format(rightNow.getTime(), sb,HELPER_POSITION);  
		numberFormat.format(seq, sb, HELPER_POSITION);  
		if (seq == MAX) {  
			seq = 0;  
		}else {  
			seq++;  
		}  
   
		logger.info("THE SQUENCE IS :" +sb.toString());  
   
		return sb.toString();  
	}
	
	public static void main(String[] args) {
		System.out.println(GenerateSequenceUtil.generateSequenceNo());
	}
}
